Can someone explain why this is not possible, because I use a website that is hosted with Vdeck panel, and everyday I can login to FTP or webmail or pop3 email using my full email address as my username (including the @).
I am testing out a few panels to host some sites and I like ISPconfig, but this 'web1_' prefix nonsense is just about enough to make me choose something else. At least can't we change it to a user_domain.com suffix or something?
Thanks!

It is not possible because linux does not allow @ signs in usernames and ISPConfig uses linux users.

I am testing out a few panels to host some sites and I like ISPconfig, but this 'web1_' prefix nonsense is just about enough to make me choose something else.

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The web1_ prefix is no nonsense at all, some major commercial controlpanels use the same syntax to separete system users. You can disable it or use the domain name as prefix. Thats all described in the manual.

At least can't we change it to a user_domain.com suffix or something?

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Sur you can, but you will have to change the ISPConfig sources for this. The sourcecode is in the file /home/admispconfig/ispconfig/lib/plugins/ispconfig_username.plugin.php

Bear in mind that some (older) *nixes limit the recognition of users stored in /etc/passwd by the 1st 8 characters. Using suffixes might bite you if you have users "alongusername_web1" and "alongusername_web2". These users will be identical for all system utilities like ssh, ftp.